import traceback
from typing import Dict, Any

import misskey
from misskey.exceptions import MisskeyAPIException

from config import NOTIFICATION_BATCH_SIZE, USE_WHITELIST
from parsing import parse_notification
from db_utils import get_config, set_config, is_whitelisted
from response import generate_response
from custom_types import BotResponse

# Define your whitelist
# TODO: move to config
WHITELISTED_INSTANCES: list[str] = []


def process_notification(
        client: misskey.Misskey,
        notification: Dict[str, Any]) -> None:
    '''Processes an individual notification'''
    user = notification.get('user', {})
    username = user.get('username', 'unknown')
    host = user.get('host')  # None if local user
    instance = host if host else 'local'

    if USE_WHITELIST and not is_whitelisted(instance):
        print(f'⚠️ Blocked notification from untrusted instance: {instance}')
        return

    # Copy visibility of the post that was received when replying (so if people
    # don't want to dump a bunch of notes on home they don't have to)
    visibility = notification['note']['visibility']
    if visibility != 'specified':
        visibility = 'home'

    notif_type = notification.get('type', 'unknown')
    notif_id = notification.get('id')
    print(f'📨 <{notif_id}> [{notif_type}] from @{username}@{instance}')

    # 🧠 Send to the parser
    parsed_notification = parse_notification(notification, client)

    if not parsed_notification:
        return

    # Get the note Id to reply to
    note_id = notification.get('note', {}).get('id')

    # Get the response
    response: BotResponse | None = generate_response(parsed_notification)

    if not response:
        return

    client.notes_create(
        text=response['message'],
        reply_id=note_id,
        visibility=visibility,
        file_ids=response['attachment_urls']
        # TODO: write actual visible users ids so pleromers can use the bot
        # privately
        # visible_user_ids=[]
    )


def process_notifications(client: misskey.Misskey) -> bool:
    '''Processes a batch of unread notifications. Returns False if there are
    no more notifications to process.'''

    last_seen_id = get_config('last_seen_notif_id')
    # process_notification writes to last_seen_id, so make a copy
    new_last_seen_id = last_seen_id

    try:
        notifications = client.i_notifications(
                # Fetch notifications we haven't seen yet. This option is a bit
                # tempermental, sometimes it'll include since_id, sometimes it
                # won't. We need to keep track of what notifications we've
                # already processed.
                since_id=last_seen_id,
                # Let misskey handle the filtering
                include_types=['mention', 'reply'],
                # And handle the batch size while we're at it
                limit=NOTIFICATION_BATCH_SIZE
        )

        # No notifications. Wait the poll period.
        if not notifications:
            return False

        # Iterate oldest to newest
        for notification in notifications:
            try:
                # Skip if we've processed already
                notif_id = notification.get('id', '')
                if notif_id <= last_seen_id:
                    continue

                # Update new_last_seen_id and process
                new_last_seen_id = notif_id
                process_notification(client, notification)

            except Exception as e:
                print(f'An exception has occured while processing a \
notification: {e}')
                print(traceback.format_exc())

        # If we got as many notifications as we requested, there are probably
        # more in the queue
        return len(notifications) == NOTIFICATION_BATCH_SIZE

    except MisskeyAPIException as e:
        print(f'An exception has occured while reading notifications: {e}\n')
        print(traceback.format_exc())
    finally:
        # Quality jank right here, but finally lets us update the last_seen_id
        # even if we hit an exception or return early
        if new_last_seen_id > last_seen_id:
            set_config('last_seen_notif_id', new_last_seen_id)

    return False